Dialogic® PowerMedia™ XMS

Message Session Relay Protocol Feature Guide

November 2022

www.dialogic.com

All contents of this document are furnished for informational use only and are subject to change without notice and

do not represent a commitment on the part of Enghouse and its affiliates or subsidiaries ("Enghouse"). Reasonable

effort is made to ensure the accuracy of the information contained in the document. However, Enghouse does not

warrant the accuracy of this information and cannot accept responsibility for errors, inaccuracies or omissions that

may be contained in this document.

INFORMATION IN THIS DOCUMENT IS PROVIDED IN CONNECTION WITH DIALOGIC® PRODUCTS. NO LICENSE,

EXPRESS OR IMPLIED, BY ESTOPPEL OR OTHERWISE, TO ANY INTELLECTUAL PROPERTY RIGHTS IS GRANTED BY

THIS DOCUMENT. EXCEPT AS PROVIDED IN A SIGNED AGREEMENT BETWEEN YOU AND ENGHOUSE, ENGHOUSE

ASSUMES NO LIABILITY WHATSOEVER, AND ENGHOUSE DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY,

Due to differing national regulations and approval requirements, certain Enghouse products may be suitable for use

only in specific countries, and thus may not function properly in other countries. You are responsible for ensuring

that your use of such products occurs only in the countries where such use is suitable. For information on specific

products, contact Enghouse at legal.operations@enghouse.com

It is possible that the use or implementation of any one of the concepts, applications, or ideas described in this

document, in marketing collateral produced by or on web pages maintained by Enghouse may infringe one or more

patents or other intellectual property rights owned by third parties. Enghouse does not provide any intellectual

property licenses with the sale of Enghouse products other than a license to use such product in accordance with

intellectual property owned or validly licensed by Enghouse and no such licenses are provided except pursuant to a

country and it is the responsibility of those who develop the concepts or applications to be aware of and comply

with different national license requirements.

Dialogic, Dialogic Pro, DialogicOne, Dialogic Buzz, Brooktrout, BorderNet, PowerMedia, PowerVille, PowerNova,

ControlSwitch, I-Gate, Veraz, Cantata, TruFax, and NMS Communications, among others as well as related logos,

are either registered trademarks or trademarks of Enghouse and its affiliates or subsidiaries. Enghouse's

trademarks may be used publicly only with permission from Enghouse. Such permission may only be granted by

Enghouse legal department at 80 Tiverton Court, Suite 800 Markham, Ontario L3R 0G4. Any authorized use

of Enghouse's trademarks will be subject to full respect of the trademark guidelines published by Enghouse from

time to time and any use of Enghouse's trademarks requires proper acknowledgement.

without limitation effects on your products, your business, or your intellectual property rights.

Dialogic® PowerMedia™ XMS ................................................................................. 1

1. Overview ....................................................................................................... 5

2. Using Message Session Relay Protocol (MSRP) .............................................. 6

Dialogic® PowerMedia™ Extended Media Server (also referred to herein as "PowerMedia

transfer, photo sharing, or chat services, and can be negotiated with an offer or answer

model using the Session Description Protocol (SDP). The exchange is carried over a Session

Initiation Protocol (SIP) signaling protocol. This feature allows PowerMedia XMS to offer a

messaging session as one of the possible media-types in a session dialog.

MSRP uses a connection-based transport called Transmission Control Protocol (TCP) to

transport messages or files. This feature enables PowerMedia XMS to create MSRP

connections and sessions that deliver arbitrary (binary) MIME content payloads. Some

content can include plain text, images, video clips, and binary file transfers over peer-to-

peer TCP connections.

PowerMedia XMS supports establishment of MSRP peer-to-peer instant messaging sessions

with the RESTful API. MSRP session file transfer is supported by MSML and the RESTful API.

For more information, refer to the Dialogic® PowerMedia™ XMS MSML Media Server

Software User's Guide and Dialogic® PowerMedia™ XMS RESTful API User's Guide.

Figure 1 shows the basic message flow between PowerMedia XMS and a remote MSRP

endpoint. The message flow results in the creation of a TCP connection and a MSRP session.

A SIP dialog is initially established with the remote MSRP endpoint to negotiate session

characteristics and create a TCP connection between the two entities (steps 1-3). In this

example, the message or file is rather long and must be divided or chunked.

Some MSRP solutions only require PowerMedia XMS to support a Client implementation, in

which case PowerMedia XMS will only send content to peer endpoints. These solutions are

fully supported by PowerMedia XMS. Other solutions requiring PowerMedia XMS to interface

with intermediate relay entities, as defined in RFC 4976, are not supported by PowerMedia

XMS at the time of this document's publication.

MSRP solutions that require interaction with PowerMedia XMS using an interface other than

MSML or RESTful are not supported.

There are examples of two specific customer configurations and use cases that MSRP

operations are controlled by a Voice Mail Application Server (VM AS) over a SIP/MSML

connection.

For this solution, PowerMedia XMS retrieves prompts and messages for playback from the

Voice Mail Storage (VM Storage) entity via HTTP as instructed through MSML control. When

a voicemail is recorded, the VM AS can instruct PowerMedia XMS to transfer the recorded

VM to the Voice Mail Delivery Server (VM DS) via a MSRP session. This results in

PowerMedia XMS constructing and sending a MSRP SIP INVITE to the VM DS.

subscriber Location Information inquiries and is eventually forwarded to the intended VM

(IMAP) is used for this purpose.

Figure 3 illustrates a sample solution configuration with a Media Resource Broker (MRB)

providing load balancing and high availability to the pool of PowerMedia XMS MRFs.

Note: Solutions can be supported by XMS that terminate MSRP sessions to endpoints

directly where the endpoints support MSRP and SIP protocols.